JP2698313B2 - Blower - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower used for an air conditioner. 2. Description of the Related Art A blower of this type is disclosed in, for example,
No. 6-8894 is known. This blower is
Permanent magnets and shafts are integrated into a plastic blower blade with a plurality of wing pieces arranged in a cylindrical shape, and a shaft integrated with the blower blades is connected and supported on a stator-side support with a stator fitted. is there. However, in the conventional configuration, since the permanent magnet and the shaft are embedded in the blower blade by insert molding, it is necessary to mount the permanent magnet and the shaft on a mold, which deteriorates the workability and melts the shaft. This has the disadvantage that the magnetic force of the permanent magnet is reduced due to the thermal effect of the plastic and the characteristics of the motor are reduced. In addition, if the molding work is performed for a long period of time, the mold becomes magnetic due to the influence of the permanent magnet, and iron powder and the like existing around adhere to the mold. In addition, the iron powder and the like that have not been removed have the disadvantage that they mix into the blower blades, resulting in poor molding. Further, a blower in which a magnet holding body for holding a magnet housed in a yoke is fixed to an end plate of a fan by screws, while an iron core is fitted to an iron core supporting member and both are connected and supported by a shaft. It is known from JP-A-52-28202. However, in the conventional configuration, since the magnet holder holding the magnet and the end plate of the fan are separate parts, they need to be fixed with screws, which deteriorates the assembling workability and increases the number of parts. It has the following disadvantages. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide a blower which improves assembly efficiency. [0007] A first means for solving the above-mentioned problems is to provide an end plate made of a sheet metal formed in a disk shape and a plurality of metal plates arranged on one surface of the end plate. Blower blade having a wing piece, a bottomed cylindrical recess formed at the center of the end plate toward the wing side, and an inner wall of the cylindrical recess from the opening side of the cylindrical recess. A rotor mounting portion having substantially the same diameter toward the bottom, a rotor inserted into and fixed to the rotor mounting portion from the opening side of the cylindrical concave portion, and fixed to a central portion of the cylindrical concave portion; Provided on the rotor side support and equipment case,
A stator-side support that supports the stator, and a shaft that is supported by the rotor-side support and the stator-side support and rotatably supports the blower blades is provided. According to the first means, the rotor mounting portion formed from the opening side of the cylindrical recess toward the bottom is provided on the inner side wall of the cylindrical recess protrudingly formed at the center of the end plate. Since the rotor can be easily inserted and fixed from the opening side of the cylindrical concave portion, the mounting operation is improved. A second means for solving the above problem is to form an end plate on which a rotor mounting portion is formed by a magnetic material. According to the second means, since the end plate on which the rotor mounting portion is formed is made of a magnetic material, it can be used also as a yoke of the rotor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on a first embodiment shown in FIG. 1 and a second embodiment shown in FIG. The first embodiment is an embodiment of a centrifugal fan used for a range hood or the like, and the second embodiment is an embodiment of a tangential fan used for a circulator or an air conditioner. The structure of a device incorporating a fan casing and a blower suitable for each blower blade is not different from that of the prior art, and is not shown and will not be described. The motor used in each embodiment may be an induction motor or a DC brushless motor. In each embodiment, a DC brushless motor M is used, a cylindrical permanent magnet is used for the outer rotor 1, and a winding is applied to the inner stator 2. Said D
The driving of the C brushless motor M is performed by a three-phase bipolar system, but may be a known driving system such as a three-phase unipolar system. The first embodiment of FIG. 1 will be described below. Reference numeral 3 denotes a centrifugal fan, which is formed by arranging a large number of blade pieces 6 between outer peripheral portions of a donut disk-shaped end plate 4 and a disk-shaped end plate 5. The donut disk-shaped end plate 4 and the wing piece 6 are formed of a light metal plate such as aluminum, and the disk-shaped end plate 5 is formed of a thin metal magnetic material such as an iron plate. Reference numeral 7 denotes a bottomed cylindrical recess formed at the center of the disc-shaped end plate 5 so as to project toward the blade piece 6. Reference numeral 31 denotes a rotor mounting portion formed in a cylindrical shape having substantially the same diameter from the opening side of the inner wall of the cylindrical concave portion 7 toward the bottom, and the rotor 1 inserted into the rotor mounting portion 31 from the opening side. It can be easily mounted by means such as press fitting or bonding. A cylindrical recess 7 formed in the disc-shaped end plate 5
A bearing cylinder 8 is attached and fixed to the bottom by rivets, screws, or the like toward the opening side, and bearings 9 that support a shaft 12 described later are mounted on both inner surfaces of the bearing cylinder 8. The bearing cylinder 8 is formed as a separate component from the disc-shaped end plate 5, and the force applied from the shaft 12 by the rotation of the centrifugal fan 3 is applied to the bearing cylinder 8.
Therefore, the disk-shaped end plate 5 to which relatively small force is applied can be made thinner, and the weight can be reduced. A cylindrical support 11 is mounted and fixed on the inner surface of the equipment case 10 by rivets, screws, etc., similarly to the bearing cylinder 8. The stator 2 is fitted on the outer periphery of the cylindrical support 11. I am wearing it. A shaft is provided in the cylindrical portion of the cylindrical support 11.
The bearing cylinder 8 is fitted on the shaft 12, is inserted into the cylindrical support 11, and a retaining washer 13 is attached to the tip of the shaft 12. Since the cylindrical concave portion 7 is formed by a disk-shaped end plate 5 made of a magnetic material, the cylindrical concave portion 7 also serves as a yoke for the rotor 1 and also has a case for the DC brushless motor M. Can be used for both purposes. Further, the disk-shaped end plate 5 also serving as a case of the DC brushless motor M is made of metal, and the heat in the DC brushless motor M is transmitted to the disk-shaped end plate 5 to be radiated to the outside and rotated. Since the cooling efficiency of the stator 1 and the stator 2 can be improved, the characteristics of the DC brushless motor M can be improved. Further, since the rotor 1 can be easily inserted and fixed to the rotor mounting portion 31 of the centrifugal fan 3, the assembling workability is improved. A second embodiment will be described below with reference to FIG. The tangential fan 15 has a disc-shaped end plate 16 at both ends, a bottomed cylindrical concave portion 17 formed of an end plate made of a thin metal magnetic material such as an iron plate, and a donut disc-shaped intermediate reinforcing plate 18, It is formed from a plurality of wing pieces 19. On the disc-shaped end plate 16, a spindle mounting body 21 on which a spindle 20 is mounted is mounted and fixed, and on the inner wall side of the cylindrical concave portion 17, a rotor mounting portion 22 has a cylindrical concave portion. The rotor 1 which is formed in a cylindrical shape having substantially the same diameter from the opening side to the bottom of the rotor 17 and which is inserted from the cylindrical recess 17 is easily mounted on the rotor mounting part 22 by means of press fitting or bonding or the like. I have. A shaft mount 24 to which a shaft 23 is mounted is fixed to the bottom of the cylindrical recess 17 toward the opening side. The shaft mounting body 24 is formed into a cylindrical recess formed by an end plate.
As a separate part from 17, the force applied from the shaft 23 by the rotation of the tangential fan 15 is received by the shaft mounting body 24, and the end plate forming the cylindrical concave portion 17 with relatively small applied force can be made thinner Thus, the weight can be reduced. A cylindrical support 27 having bearings 26 mounted on both inner surfaces thereof is fixedly mounted on the equipment case 25.
The stator 2 is fitted around the outer periphery of the 27 cylindrical portion. The shaft 23 is inserted and supported by the cylindrical support 27, and a stopper washer 28 is attached to a tip of the shaft 23. Further, the support shaft 20 is a bearing mounting body mounted on an equipment case 25.
It is supported by 29 bearings 30. Since the rotor mounting portion 22 of the cylindrical concave portion 17 is also formed of a magnetic material, it also serves as the yoke of the rotor 1 as in the first embodiment, and has a DC brushless motor M Case can also be used. The cylindrical concave portion 17 also serving as a case of the DC brushless motor M is made of metal, and the heat in the DC brushless motor M is transmitted to the cylindrical concave portion 17 and radiated to the outside. Since the cooling efficiency of the child 2 can be improved, the characteristics of the DC brushless motor can be improved as in the first embodiment. Further, also in the second embodiment, the rotor 1 can be easily inserted into and fixed to the rotor mounting portion 22 of the tangential fan 15, so that the assembling workability is improved. According to the first aspect of the present invention, the rotor mounting portion is formed from the opening side of the cylindrical concave portion of the blower blade end plate toward the bottom portion, so that the blower blade can be attached to the blower blade. The workability of mounting the rotor can be improved. In addition, the rotor-side support and the end plate are separate parts, and the rotor-side support receives the force transmitted from the shaft by the rotation of the blower blade, so that the end plate with relatively small applied force can be made thinner. It becomes possible and weight reduction can be achieved. Further, by configuring the end plate with metal, the cooling efficiency of the rotor and the stator can be improved, the characteristics of the motor can be improved, and the size and weight of the motor can be reduced. In addition to the fact that the weight can be reduced by reducing the thickness of the plate, there is an effect that the weight of the blower can be further reduced. According to the configuration of the second aspect of the present invention, since the rotor mounting portion of the blower blade is made of a magnetic material, there are effects such as being able to double as the rotor yoke.

[Brief description of the drawings] FIG. 1 is a sectional view showing a first embodiment of the present invention. FIG. 2 is a sectional view showing a second embodiment of the present invention. [Explanation of symbols] 1 rotor 2 Centrifugal fan (blowing blade) 5 Disc-shaped end plates (end plates) 6 Wing pieces 7 Cylindrical recess 8 Bearing cylinder (rotor side support) 11 Cylindrical support (stator side support) 12 shaft 31 Rotor mounting part

Claims (1)

(57) [Claims] A blower blade having an end plate made of a thin metal sheet formed in a disk shape and a plurality of blade pieces arranged on one surface of the end plate; and a projecting portion formed at a central portion of the end plate toward one of the blades. A cylindrical recess with a bottom, a rotor mounting portion formed on the inner side wall of the cylindrical recess with substantially the same diameter from the opening side of the cylindrical recess toward the bottom portion, and a cylinder mounted on the rotor mounting portion. A rotor inserted and fixed from the opening side of the cylindrical recess, a rotor-side support fixed to the center of the cylindrical recess, and a stator-side support provided in the equipment case and supporting the stator, A blower, comprising: a shaft supported by the rotor-side support and a stator-side support, and rotatably supporting a blower blade. 2. The blower according to claim 1, wherein the end plate on which the rotor mounting portion is formed is made of a magnetic material.